Pressure-relief valve for pneumatic tires.



WILLIAM J'. MORRISON, 0F SIOUX CITY, IOWA.

PBSSURl-,RELIEF VALVE FOR PNEUMATIC TIRES..

Specification ci' Letters Patent.

Patented Feb. 10, 1914.

Application filed February 15, 1913. 4 Serial No1 748,652.

To all @from t may concern:

Beit known that I, WILLIAM J. Monnisori, a citizen of the United States,residing at Sioux City, in the county of Woodbury and State of Iowa,have invented new Aand use ful Improvements in Pressure-Relief Valvesfor Pneumatic Tires, or which the followin is a'specilication. N .lhisinvention` relates to air relief valves for pneumatic tires' and thelike, the object in view'being to rovide a valve of the class referredto Whic will' liberate air from a tire in case the internal expansionand pressure thereof becomes excessive, so as to prevent' injury to thetire, such as unusual strains and theconsequent giving away and blowingout of the same. f

A further object of the invention is to provide a valve of the. classreferred to which is readily applicable to the tube of the ordinaryvalve now commonly used in connection with pneumatic tires.

With the above and other objects in view, the invention consists in theconstruction, combination and arrangement of arts, as will behereinafter more fully dlescribed, illustrated inthe accompanyingdrawings,

rand pointed out in the claims hereunto appended.

In the drawings: Figure 1 is a side elevation of the rel-lef valve oijfthis invention shown 'applied to the ordinary valve tube of a pneumatictire. Fig. 2 is a longitudinal section tlirough theA saine.

In the drawings, I haveshown the ordinar pneumatic tire valve, which, asis well un erstood, comprises the externally thread- Aed valve tube 1having the central bore or opening 2 extending entirely through thesame, and provided atone end with a head 3, and 'adjacent thereto with aWasher L1,

y and'nut 5, by means of whichthe valve tube may be Jsecured to theinner tube 6 of a pneumatic tire, the outerl caseor shoe of which isshown at 7..

The outer end of the bore 2 is, as usual, enlarged, as shown at 8, toreceive the valve seat 9 and valve 10, thelatter being mounted on thestem 11, and the valve being normally closed by means of an ex ansionspring 12- arranged behind the va ve and bearing against a suitable restor shoulder 13. As is vvllunderstood, the stem 11 Iof the valve 10normally projects Well toward, and in some cases beyond, the extremityof the valve tube 1, which is ordinarily re duced and externallythreaded, as at 14. Ordinarily, in fastening the valve tube in place,with respect to the telly 15 of the Wheel, a nut is threaded on thevalve tube 1, said nut being shown at 16 as bearing against the innerface of the felly 15.

. All of the parts hereinabove described are found in the ordinary valvewith which pneumatic tires are supplied Afor inflation and deflationpurposes.

In carrying out the present'invent-ion, I provide a special. nut 16having an extending sleeve portion 17 which is threaded both exteriorlyand interiorly, as shown in Fi 2, the interior threads being provided toa apt the nut 16 and sleeve 17 to be adjusted inwardly and outwardly onthe valve tube 1, the external threads being provided for a lock nut 18,by means of which the relief valve tube, hereinafter described, is heldlocked onthe sleeve 17. `The sleeve 17, togather with the nut 16, thusforms a union, by means of which the relief valve tube is connected tothe ordinary valve tube.

The relief valve as a Whole col'nprises a relief valve body 19 having acentral longitudinal bore extending entirely through the same. froml endto end, said bore being re duced, at 20, to form a shoulder, againstwhich is seated a corresponding shoulder 21 on a core 22 which occupiesa position about centrally of the length of the'relief valve tube 19,said core being provided with a central hole 23 extending longitudinallythrough the same, and the core being further provided with al reducedvalve displacing extension or shoulder 24 transversely bored through, asshown at 25, so as to allow the air to pass from the ordinary valve tube1 through the hole 23 into `the outer end portion'oi the relier` valvetiibe 19, Where 1t is checked by the pressure relief valve, hereinafterparticularly described.

The tube 19 is internally threaded, as shown at 26, to screw upon thevulve tube 1,

as shown in Fig. 2, the tube 19 being I provided between the reliefvalve and its capable of being adjusted relatively thereto, and lockedvin a fixed position.

The tube 19 is provided at its outer extremityvvith'an internallybeveled valve seat 27, vwith "which cooperates the correspondinglybeveled face 28 of a relief valve 29.

additionto the seat 27, the outer extremity of the tube 19 isprovidedwith a groove 30, in which is placed a 4rubber gasket 31. The

= valve 29 is provided with an annular rib or .projecting face 32 whichbears directly iin'stthe rubber Igasket or seat 31. The s 28 and 32 ofthe valve 29 are concentric with each other, as are also the'bearingfacesv 27 and the gasket 31 of the tube 19.' In this Way, a metal tometal contact is seat, vand iii addition thereto, 'a metal to rubberContact which positively excludes dust and prevents leakage of air, whenthe relief valve is held against its seat.

The relief'valve 29 is ordinarily held to its seat by a pressureretaining spring 33, at the opposite ends of ivhicli are guides 34 and35, theguide 35 being provided With a socket 36 which receives a stud orprojection 37 on the outer end of the Vvalve 29. `Tlie guide 34 isprovided Witlr' socket 38, in which tits the rounded inner extremity 39of a tension screw 40 provided with a suitable head 4l adaptingit.'tnboturned in or out.fI The screw 40js' threaded into the solid outerendf` 42 of a'spring casing 43 which incloses the' spring. 33, and itsguides 34 and 35,l and hasfafthreaded connection, at 44, with theouter-'extremity of the valve tube 19. A cap-45 is threaded upon theotiter'end of thespring casing 43, as shown at 46, Whilea' lockii-utel-LT/isl threaded on the tension screw 40 and bears against the,adjacent extreniity of the/part.42.A By turning the screw 4l, morev orless tension may be given to the spring 33 to correspondingly vary itspressure against ,the valve 29, so as to enable the latter to retain air-ir vthe tire at a/predeterinined pressure. 48 designates a vent inthespring casing 43, through which the/air,brought. about by excessive airpressure in the' tire escapes to the atmospheref; Y i

From the foregoing description, it Will now be understood that the airrelief valve Whole is adapted vto be coupled to the ordinary valve tubeof a pneumatic tire by means of a threaded union, which. also acts to'hold 'the ordinary valve tube` in clamped to the-Wheel 'fclly:Furthermore e .reliefjlvalve asia; vvgnolefua'y be we] usted yWitnesses:

longitudinally of the ordinary valve tube 1, so as to unseat the valve10 and position the parts so as to allow the air from the tire topassthrough and beyond the core. 22, Where it Will act on and be held incheck by the relief valve 29.A In Warm ,Weather or in traveling oversandy roads, where the air in the tire becomes overheated, and thereforeexpands, in case the pressureexceeds a certain predetermined point ofsafety, such excessive pressure Will displace the valve 29 and allow theair to pass through the vent 48. This' obviates any possibility of thetire becoming expanded and strained to an excessive point, and,therefore, greatly increases the life and durability of the tire 'withwhich the relief valve of this invention is associated.

What is claimed is:v A l. A pressure reliefl valve for pneumatic tires,comprising a pressure relief valve tube having an annular-.conicalmetal'valve seat, an annular rubber valve seatconcentridwitli' the metalseat, a relief valve embodying a conical face and an annular projectingrib respectively bearing against the metal and rubber seats, a pressure`retaining spring pressing said valve toward the seats, and a threadedunion for n iounting the pressure relief valveas a Whole on theordina-ry valve tube of a pneumatic tire.

2. A pressure relief valve for pneumatic-90 tires, comprisinga pressure'relief valve tube having an annular metal valve seat, a rub-L ber valveseat concentric with the metal seat,

ico

ing 'the pressure relief v-alveas a Whole on the ordinary valve tube ofa pneumatic tire.

in presence'of two Witnesses. WILLLiM Yl. MQRRISON.

ELsi-n V. BnnrHEn'ron, R; A. OLIVER.

In testimony whereof I aiiiX-iny signature

